1 files changed, 396 insertions, 0 deletions
diff --git a/parts/django/django/core/urlresolvers.py b/parts/django/django/core/urlresolvers.py
new file mode 100644
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--- /dev/null
+++ b/parts/django/django/core/urlresolvers.py
@@ -0,0 +1,396 @@
+"""
+This module converts requested URLs to callback view functions.
+
+RegexURLResolver is the main class here. Its resolve() method takes a URL (as
+a string) and returns a tuple in this format:
+
+    (view_function, function_args, function_kwargs)
+"""
+
+import re
+
+from django.http import Http404
+from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured, ViewDoesNotExist
+from django.utils.datastructures import MultiValueDict
+from django.utils.encoding import iri_to_uri, force_unicode, smart_str
+from django.utils.functional import memoize
+from django.utils.importlib import import_module
+from django.utils.regex_helper import normalize
+from django.utils.thread_support import currentThread
+
+_resolver_cache = {} # Maps URLconf modules to RegexURLResolver instances.
+_callable_cache = {} # Maps view and url pattern names to their view functions.
+
+# SCRIPT_NAME prefixes for each thread are stored here. If there's no entry for
+# the current thread (which is the only one we ever access), it is assumed to
+# be empty.
+_prefixes = {}
+
+# Overridden URLconfs for each thread are stored here.
+_urlconfs = {}
+
+class Resolver404(Http404):
+    pass
+
+class NoReverseMatch(Exception):
+    # Don't make this raise an error when used in a template.
+    silent_variable_failure = True
+
+def get_callable(lookup_view, can_fail=False):
+    """
+    Convert a string version of a function name to the callable object.
+
+    If the lookup_view is not an import path, it is assumed to be a URL pattern
+    label and the original string is returned.
+
+    If can_fail is True, lookup_view might be a URL pattern label, so errors
+    during the import fail and the string is returned.
+    """
+    if not callable(lookup_view):
+        try:
+            # Bail early for non-ASCII strings (they can't be functions).
+            lookup_view = lookup_view.encode('ascii')
+            mod_name, func_name = get_mod_func(lookup_view)
+            if func_name != '':
+                lookup_view = getattr(import_module(mod_name), func_name)
+                if not callable(lookup_view):
+                    raise AttributeError("'%s.%s' is not a callable." % (mod_name, func_name))
+        except (ImportError, AttributeError):
+            if not can_fail:
+                raise
+        except UnicodeEncodeError:
+            pass
+    return lookup_view
+get_callable = memoize(get_callable, _callable_cache, 1)
+
+def get_resolver(urlconf):
+    if urlconf is None:
+        from django.conf import settings
+        urlconf = settings.ROOT_URLCONF
+    return RegexURLResolver(r'^/', urlconf)
+get_resolver = memoize(get_resolver, _resolver_cache, 1)
+
+def get_mod_func(callback):
+    # Converts 'django.views.news.stories.story_detail' to
+    # ['django.views.news.stories', 'story_detail']
+    try:
+        dot = callback.rindex('.')
+    except ValueError:
+        return callback, ''
+    return callback[:dot], callback[dot+1:]
+
+class RegexURLPattern(object):
+    def __init__(self, regex, callback, default_args=None, name=None):
+        # regex is a string representing a regular expression.
+        # callback is either a string like 'foo.views.news.stories.story_detail'
+        # which represents the path to a module and a view function name, or a
+        # callable object (view).
+        self.regex = re.compile(regex, re.UNICODE)
+        if callable(callback):
+            self._callback = callback
+        else:
+            self._callback = None
+            self._callback_str = callback
+        self.default_args = default_args or {}
+        self.name = name
+
+    def __repr__(self):
+        return '<%s %s %s>' % (self.__class__.__name__, self.name, self.regex.pattern)
+
+    def add_prefix(self, prefix):
+        """
+        Adds the prefix string to a string-based callback.
+        """
+        if not prefix or not hasattr(self, '_callback_str'):
+            return
+        self._callback_str = prefix + '.' + self._callback_str
+
+    def resolve(self, path):
+        match = self.regex.search(path)
+        if match:
+            # If there are any named groups, use those as kwargs, ignoring
+            # non-named groups. Otherwise, pass all non-named arguments as
+            # positional arguments.
+            kwargs = match.groupdict()
+            if kwargs:
+                args = ()
+            else:
+                args = match.groups()
+            # In both cases, pass any extra_kwargs as **kwargs.
+            kwargs.update(self.default_args)
+
+            return self.callback, args, kwargs
+
+    def _get_callback(self):
+        if self._callback is not None:
+            return self._callback
+        try:
+            self._callback = get_callable(self._callback_str)
+        except ImportError, e:
+            mod_name, _ = get_mod_func(self._callback_str)
+            raise ViewDoesNotExist("Could not import %s. Error was: %s" % (mod_name, str(e)))
+        except AttributeError, e:
+            mod_name, func_name = get_mod_func(self._callback_str)
+            raise ViewDoesNotExist("Tried %s in module %s. Error was: %s" % (func_name, mod_name, str(e)))
+        return self._callback
+    callback = property(_get_callback)
+
+class RegexURLResolver(object):
+    def __init__(self, regex, urlconf_name, default_kwargs=None, app_name=None, namespace=None):
+        # regex is a string representing a regular expression.
+        # urlconf_name is a string representing the module containing URLconfs.
+        self.regex = re.compile(regex, re.UNICODE)
+        self.urlconf_name = urlconf_name
+        if not isinstance(urlconf_name, basestring):
+            self._urlconf_module = self.urlconf_name
+        self.callback = None
+        self.default_kwargs = default_kwargs or {}
+        self.namespace = namespace
+        self.app_name = app_name
+        self._reverse_dict = None
+        self._namespace_dict = None
+        self._app_dict = None
+
+    def __repr__(self):
+        return '<%s %s (%s:%s) %s>' % (self.__class__.__name__, self.urlconf_name, self.app_name, self.namespace, self.regex.pattern)
+
+    def _populate(self):
+        lookups = MultiValueDict()
+        namespaces = {}
+        apps = {}
+        for pattern in reversed(self.url_patterns):
+            p_pattern = pattern.regex.pattern
+            if p_pattern.startswith('^'):
+                p_pattern = p_pattern[1:]
+            if isinstance(pattern, RegexURLResolver):
+                if pattern.namespace:
+                    namespaces[pattern.namespace] = (p_pattern, pattern)
+                    if pattern.app_name:
+                        apps.setdefault(pattern.app_name, []).append(pattern.namespace)
+                else:
+                    parent = normalize(pattern.regex.pattern)
+                    for name in pattern.reverse_dict:
+                        for matches, pat in pattern.reverse_dict.getlist(name):
+                            new_matches = []
+                            for piece, p_args in parent:
+                                new_matches.extend([(piece + suffix, p_args + args) for (suffix, args) in matches])
+                            lookups.appendlist(name, (new_matches, p_pattern + pat))
+                    for namespace, (prefix, sub_pattern) in pattern.namespace_dict.items():
+                        namespaces[namespace] = (p_pattern + prefix, sub_pattern)
+                    for app_name, namespace_list in pattern.app_dict.items():
+                        apps.setdefault(app_name, []).extend(namespace_list)
+            else:
+                bits = normalize(p_pattern)
+                lookups.appendlist(pattern.callback, (bits, p_pattern))
+                if pattern.name is not None:
+                    lookups.appendlist(pattern.name, (bits, p_pattern))
+        self._reverse_dict = lookups
+        self._namespace_dict = namespaces
+        self._app_dict = apps
+
+    def _get_reverse_dict(self):
+        if self._reverse_dict is None:
+            self._populate()
+        return self._reverse_dict
+    reverse_dict = property(_get_reverse_dict)
+
+    def _get_namespace_dict(self):
+        if self._namespace_dict is None:
+            self._populate()
+        return self._namespace_dict
+    namespace_dict = property(_get_namespace_dict)
+
+    def _get_app_dict(self):
+        if self._app_dict is None:
+            self._populate()
+        return self._app_dict
+    app_dict = property(_get_app_dict)
+
+    def resolve(self, path):
+        tried = []
+        match = self.regex.search(path)
+        if match:
+            new_path = path[match.end():]
+            for pattern in self.url_patterns:
+                try:
+                    sub_match = pattern.resolve(new_path)
+                except Resolver404, e:
+                    sub_tried = e.args[0].get('tried')
+                    if sub_tried is not None:
+                        tried.extend([(pattern.regex.pattern + '   ' + t) for t in sub_tried])
+                    else:
+                        tried.append(pattern.regex.pattern)
+                else:
+                    if sub_match:
+                        sub_match_dict = dict([(smart_str(k), v) for k, v in match.groupdict().items()])
+                        sub_match_dict.update(self.default_kwargs)
+                        for k, v in sub_match[2].iteritems():
+                            sub_match_dict[smart_str(k)] = v
+                        return sub_match[0], sub_match[1], sub_match_dict
+                    tried.append(pattern.regex.pattern)
+            raise Resolver404({'tried': tried, 'path': new_path})
+        raise Resolver404({'path' : path})
+
+    def _get_urlconf_module(self):
+        try:
+            return self._urlconf_module
+        except AttributeError:
+            self._urlconf_module = import_module(self.urlconf_name)
+            return self._urlconf_module
+    urlconf_module = property(_get_urlconf_module)
+
+    def _get_url_patterns(self):
+        patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
+        try:
+            iter(patterns)
+        except TypeError:
+            raise ImproperlyConfigured("The included urlconf %s doesn't have any patterns in it" % self.urlconf_name)
+        return patterns
+    url_patterns = property(_get_url_patterns)
+
+    def _resolve_special(self, view_type):
+        callback = getattr(self.urlconf_module, 'handler%s' % view_type)
+        try:
+            return get_callable(callback), {}
+        except (ImportError, AttributeError), e:
+            raise ViewDoesNotExist("Tried %s. Error was: %s" % (callback, str(e)))
+
+    def resolve404(self):
+        return self._resolve_special('404')
+
+    def resolve500(self):
+        return self._resolve_special('500')
+
+    def reverse(self, lookup_view, *args, **kwargs):
+        if args and kwargs:
+            raise ValueError("Don't mix *args and **kwargs in call to reverse()!")
+        try:
+            lookup_view = get_callable(lookup_view, True)
+        except (ImportError, AttributeError), e:
+            raise NoReverseMatch("Error importing '%s': %s." % (lookup_view, e))
+        possibilities = self.reverse_dict.getlist(lookup_view)
+        for possibility, pattern in possibilities:
+            for result, params in possibility:
+                if args:
+                    if len(args) != len(params):
+                        continue
+                    unicode_args = [force_unicode(val) for val in args]
+                    candidate =  result % dict(zip(params, unicode_args))
+                else:
+                    if set(kwargs.keys()) != set(params):
+                        continue
+                    unicode_kwargs = dict([(k, force_unicode(v)) for (k, v) in kwargs.items()])
+                    candidate = result % unicode_kwargs
+                if re.search(u'^%s' % pattern, candidate, re.UNICODE):
+                    return candidate
+        # lookup_view can be URL label, or dotted path, or callable, Any of
+        # these can be passed in at the top, but callables are not friendly in
+        # error messages.
+        m = getattr(lookup_view, '__module__', None)
+        n = getattr(lookup_view, '__name__', None)
+        if m is not None and n is not None:
+            lookup_view_s = "%s.%s" % (m, n)
+        else:
+            lookup_view_s = lookup_view
+        raise NoReverseMatch("Reverse for '%s' with arguments '%s' and keyword "
+                "arguments '%s' not found." % (lookup_view_s, args, kwargs))
+
+def resolve(path, urlconf=None):
+    if urlconf is None:
+        urlconf = get_urlconf()
+    return get_resolver(urlconf).resolve(path)
+
+def reverse(viewname, urlconf=None, args=None, kwargs=None, prefix=None, current_app=None):
+    if urlconf is None:
+        urlconf = get_urlconf()
+    resolver = get_resolver(urlconf)
+    args = args or []
+    kwargs = kwargs or {}
+
+    if prefix is None:
+        prefix = get_script_prefix()
+
+    if not isinstance(viewname, basestring):
+        view = viewname
+    else:
+        parts = viewname.split(':')
+        parts.reverse()
+        view = parts[0]
+        path = parts[1:]
+
+        resolved_path = []
+        while path:
+            ns = path.pop()
+
+            # Lookup the name to see if it could be an app identifier
+            try:
+                app_list = resolver.app_dict[ns]
+                # Yes! Path part matches an app in the current Resolver
+                if current_app and current_app in app_list:
+                    # If we are reversing for a particular app, use that namespace
+                    ns = current_app
+                elif ns not in app_list:
+                    # The name isn't shared by one of the instances (i.e., the default)
+                    # so just pick the first instance as the default.
+                    ns = app_list[0]
+            except KeyError:
+                pass
+
+            try:
+                extra, resolver = resolver.namespace_dict[ns]
+                resolved_path.append(ns)
+                prefix = prefix + extra
+            except KeyError, key:
+                if resolved_path:
+                    raise NoReverseMatch("%s is not a registered namespace inside '%s'" % (key, ':'.join(resolved_path)))
+                else:
+                    raise NoReverseMatch("%s is not a registered namespace" % key)
+
+    return iri_to_uri(u'%s%s' % (prefix, resolver.reverse(view,
+            *args, **kwargs)))
+
+def clear_url_caches():
+    global _resolver_cache
+    global _callable_cache
+    _resolver_cache.clear()
+    _callable_cache.clear()
+
+def set_script_prefix(prefix):
+    """
+    Sets the script prefix for the current thread.
+    """
+    if not prefix.endswith('/'):
+        prefix += '/'
+    _prefixes[currentThread()] = prefix
+
+def get_script_prefix():
+    """
+    Returns the currently active script prefix. Useful for client code that
+    wishes to construct their own URLs manually (although accessing the request
+    instance is normally going to be a lot cleaner).
+    """
+    return _prefixes.get(currentThread(), u'/')
+
+def set_urlconf(urlconf_name):
+    """
+    Sets the URLconf for the current thread (overriding the default one in
+    settings). Set to None to revert back to the default.
+    """
+    thread = currentThread()
+    if urlconf_name:
+        _urlconfs[thread] = urlconf_name
+    else:
+        # faster than wrapping in a try/except
+        if thread in _urlconfs:
+            del _urlconfs[thread]
+
+def get_urlconf(default=None):
+    """
+    Returns the root URLconf to use for the current thread if it has been
+    changed from the default one.
+    """
+    thread = currentThread()
+    if thread in _urlconfs:
+        return _urlconfs[thread]
+    return default